Inhaltsverzeichnis
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FLOW CHART NO.27 IGR TROUBLESHOOTING
No IGR sound.
Is there a base band signal at pin (23) of
|
NO
TU1501 ?
YES
Is there a base band signal at pin (2) of.
NO
1C1601 (FM Demod.) ?
YES
Is there a SIF signal at pin (8) of C1601?
z o
YES
Replace 1C1601.
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Is there a SIF signal at pin (8) of IC1602(IGR
| N
Decoder) ?
YES
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Is there a IGR audio signal at pins (12) and
NO
(11) of 11602 ?
YES
Check peripheral. | N
circuit of X601.
Replace IC1602.
le)
Check peripheral circuit of TU1501.
Check between pin (23) of TU1501 and all
the way up thru to pin (2) of IC1601.
Check TU PC 12V line.
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Is 12V supplied at pin (4) of 1C1601 ?
YES
Check T1601 (5.74MHz TANK COIL ADJ.).
YES
Check peripheral circuit of 1C1601.
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wv
Check R1611(SUB CH. LEVEL ADJ.).
YES
Check between pin (8) of !C1601 and all the
way up thru to pin (8) of 1C1602.
Check TU PC 5V line.
NO
Is 5V supplied at pin (18) of 1C1602 ?
YES
Check serial data and clock at pins (1) and
{20) of IC1602.
YES
Is there oscillated 10.0MHz at pin (19) of
1C1602 ?
YES
Check T1602 (54.7KHz PICK UP COIL ADJ.)
YES
Check peripheral circuit of |C1602.
FLOW CHART NO.28 NICAM TROUBLESHOOTING
No NICAM sound.
Is there a base band signal at pin (23) of
NO
TU1501?
Check peripheral circuit of TU1501.
YES
Is there a base band signal at pin (29) of
NO
Check between pin (23) of TU1501 and all
1€1701 (NICAM DECODER) ?
the way up thru to pin (29) of IC1701.
YES
Check AT SV line.
NO
Is there a NICAM audio signal at pins (11) and
NO
Is SV supplied at pins (35), (38), (61) and (49)
(4) of 1C1701.
of 1C1701 ?
YES
YES
Check serial data and clock at pins (53) to
pins (11) and (4) of 1¢1701 ?
YES
Check peripheral
| NO
Is there oscillated 8.192MHz at pins (41) and
circuit of X1701.
(42) of C1701 ?
YES
Replace IC1701.
Check peripheral circuit of (C1701.
Check between pins (11) and (4) of C1701 and all the way up thru to pins (2) and (35) of IC6301.
FLOW CHART NO.29 FM SOUND TROUBLESHOOTING
Check peripheral circuit of TU1501.
Is there a FM audio signal at pin (20) of
TU1501 ?
YES
Is there a FM audio signal at emitter of
Q1501 7
YES
Check between emitter of Q1501 and all the way up thru to pin (32) of 1C6301 and pin (7) of IC1602.
Check peripheral circuit of Q1501.
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